Helical-wire brush



(umm.)

o P. P. PrBLD. HelicaIWre Brush.

No. 232,636. Patented sept. 28, sso.

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UNITED STATES PATENT nmen.

FRANCIS F. FIELD, OF STAPLETON, NEW YORK.

HELlCAL-WIRE BRUSH.

SPECIFICATION forming part of Letters Patent No. 232,636, dated September 28, 1880.

Application filed August 18, 1880.

To all whom it .may concern:

Be it known that I, FRANCIS F. FIELD, of Stapleton, in the county of lRichmond and State of New York, have invented a new and useful Improvement in Helical-Wire Brushes, of which the following is a specification.

My invention relates to that class of wire brushes for cleaning boiler-tubes and for other purposes in which the wire bristles are arranged in helical form upon a central axis by being held at their middle between four longitudinal binding-wires twisted together, said binding-wires being then inserted and secured with their outer ends in a tube threaded for the attachment of a rod, by which latter the brush is operated.

A wire brush of this kind was patented to me in the United States October 10, 1871, by Letters Patent No. 119,752, which shows two single helical rows of wire bristles meeting at their center at right angles to each other.

My present invention is an improvement upon that just referred to, and has for its object to provide a brush of greater compactness and strength, and presenting more points for contact with the surface to be cleaned, thereby conforming more readily to inequalities in the tube and better adapting the brush to hard service. V

In the accompanyin g drawings, Figure l represents a side view of my improved wire brush. Fig. 2 is an end view of the same, the binding-wires being shown in section. Fig. 3 is a cross-section of the sane, showing only two adjacent pairs of single parallel-wire bristles interlacing with the binding-wires.

Similar letters of reference indicate corresponding parts.

A designates the core of binding-wires aa', between which the wire bristles b b' `areinserted in rows of alternate layers, at right angles to each other, said rows being caused to assume a helical shape, as in Fig. 1, by twisting together the binding-wires.

One end of the coreA is inserted and secured in a tube, O, whose end is threaded at c for (Model.)

attachment to the rod by which the brush is operated.

D i s the body of the brush, formed, as aforesaid, of helical rows of wire bristles.

In my patent previously referred to the bristles were arranged in single rows, meeting at their centers at right angles to each other, by being inserted parallel with the side of the square forned'by the four binding-wires, or, in other words, by being held between four binding-wires, two on each side of the row.

In my present invention (see Figs. 2 and 3) the wire bristles are arranged in double rows or pairs, meeting at opposite sides of their center, at right angles to each other, by being inserted parallel with the diagonals of the square formed by the four binding wires. Thus the two members b l) of one pair, B, are kept separate and parallel with each other by the two diagonally-opposite binding-wires a a, and are held between these and the two diagonally-opposite binding-wires a' a', which separate the members b' b' of the adjacent pair B'. So are also the members b' b' of the pair B' held betweentheir separating-wires a' a' and the diagonally-opposite wires a a, which separate the members b b of the pair B.

It will be seen that the adjacent wires do not meet at their centers, as in my brush of 75 may be inserted singly or in thicknesses of Having thus described myinvention, I claim as new and desire to secure by Letters Patent- An improved Wire brush in which the ad- 5 jacent wire bristles are arranged in pairs, B B', of parallel members, the menbers b b of each pair B being separated at their inner edges by tWo centrally and diagonally opposite binding-wires, a a, and held at their outer edges o by two centrally and diagon ally opposite binding-wires, a' al, separating the members b' b' of the other pair B', the members of one pair meeting those of the adjacent pair at right angles at laterally-opposite sides of their respective centers, substantially as shown and 15 described.

'FRANCIS F. FIELD. Witnesses:

A. W. ALMQVIsT, J oHN M. STELLE. 

